Child&#39;s seat insert



FIG. 1 is a left front top perspective view of a child's seat insert embodying my design;

FIG. 2 is a right side elevational view of the design as shown in FIG. 1;

FIG. 3 is a rear elevational view of the design as shown in FIG. 1;

FIG. 4 is a bottom plan view of the design as shown in FIG. 1; and,

FIG. 5 is a top plan view of the design as shown in FIG. 1. 

The ornamental design for a child's seat insert, as shown and described. 